中国科学院数学与系统科学研究院期刊网
AMS
Classification of Flat Lagrangian Surfaces in Complex Lorentzian Plane
Bang-Yen CHEN, Johan FASTENAKELS
Acta Mathematica Sinica . 2007, (12): 2111 -2144 .  DOI: 10.1007/s10114-007-0991-z